Where is the 'healthiest' charter school sector?

According to the National Alliance for Public Charter Schools, Washington, D.C., has the healthiest charter school movement in the country. In the group’s “Health of the Charter Public School Movement: A State-by-State Analysis” report, Washington gets high marks because half of its public schools are charter schools, those schools serve a high percentage of racial minorities and students learn more in charters compared to traditional public schools, among other factors.

The rankings measure “movement growth, innovation and quality.” Indiana is the highest-scoring state on the rankings, followed by Michigan, Massachusetts and Louisiana.